init.el

(setq package-archives '(("MELPA" . "http://melpa.org/packages/")
                         ("ELPA" . "http://tromey.com/elpa/")
                         ("gnu"  . "http://elpa.gnu.org/packages/")))

(package-initialize)
(package-refresh-contents)

(package-install 'use-package)
(package-install 'req-package)

(require 'use-package)
(require 'req-package)

(req-package helm)

(req-package-finish)